A Claude Code Agent Skill built from Dex Horthy's (HumanLayer) playbook on David Ondrej's podcast.

"Once the model has written thousands of lines of code, it is harder to change. The sessions that generate design docs are context-light — you get the most model intelligence when you do the hard thinking early."

By default, agents build horizontally: all the backend, then all the frontend, then a 2,000-line diff lands in your lap and reviewing it is your problem. This skill flips that. Every decision that matters gets made before the code exists — where changing your mind costs a sentence, not a rewrite.

We're building a production-grade, simple and straight-forward 3D Game Engine for Windows, macOS and Linux (Ubuntu 24+). This is professional-grade software that needs to be stable, fully-tested, and real-world deployable. No hacks, no shortcuts - solid as a rock.

• Ask questions only when absolutely necessary - work autonomously
• IMRORTANT! DO NOT look outside of working directory or use other code on my computer as reference
• Start by asking question to determine engine name. Suggest a few
• Testing is of the utmost importance - use lots of unit tests (any framework, simple is good), run automated testing
• Setup a scene used for testing, which tests every single feature in the engine - all components, and entire scripting API

After migrating from Spotify to YouTube Music, I had the issue that my "liked songs" became a playlist on YouTube Music, instead of "liked songs".

I automatically added this entire playlist to likes song using the following steps.

1. Open YouTube Music in your browser.
2. Open the playlist you want to like.
3. Scroll to the very bottom so all songs load.
4. Press F12 to open Developer Tools → go to the Console tab.